Prospective aquatic risk assessment for chemical mixtures in agricultural landscapes.

ABSTRACT: Environmental risk assessment of chemical mixtures is challenging because of the multitude of possible combinations that may occur. Aquatic risk from chemical mixtures in an agricultural landscape was evaluated prospectively in 2 exposure scenario case studies: at field scale for a program of 13 plant-protection products applied annually for 20 yr and at a watershed scale for a mixed land-use scenario over 30 yr with 12 plant-protection products and 2 veterinary pharmaceuticals used for beef cattle. Risk quotients were calculated from regulatory exposure models with typical real-world use patterns and regulatory acceptable concentrations for individual chemicals. The results could differentiate situations when there was concern associated with single chemicals from those when concern was a

SUBMITTER: Holmes CM 

PROVIDER: S-EPMC5873440 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature